Accept Mac Latin name entries as ASCII as well.

It assumes all names are encoded in UTF16-BE.  Other than that, and not
listing languages correctly, it's *supposed* to work.

Fix a bug in CBDT sanitize, and redundant check in avar.

Sorry for the noise, downstream custom builders.  Please adjust.

Such a headache that Windows defines UINT8, ...; Just prefix it.

(And prevent it from happening in the future.)

Not functional change (expected!).

This makes a lot of code safer.  We only try modifying the object in one
place, after making sure it's safe to do so.  So, do a const_cast<> in
that one place...

Avoids USHORT, SHORT, ULONG, LONG clashes with Windows API.

Should fix warnings generated when building with -Wunused-private-field.
Based on patch from Jonathan Kew.

More to come, for APPLY, CLOSURE, etc.